Modified cosmology through Kaniadakis horizon entropy

Abstract We apply the gravity-thermodynamics conjecture, namely the first law of thermodynamics on the Universe horizon, but using the generalized Kaniadakis entropy instead of the standard Bekenstein–Hawking one. The former is a one-parameter generalization of the classical Boltzmann–Gibbs–Shannon...

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Autores principales:	Andreas Lymperis, Spyros Basilakos, Emmanuel N. Saridakis
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
Acceso en línea:	https://doaj.org/article/783dc5a63ddd40b5a697ecfe291085c4
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spelling	oai:doaj.org-article:783dc5a63ddd40b5a697ecfe291085c42021-11-28T12:11:53ZModified cosmology through Kaniadakis horizon entropy10.1140/epjc/s10052-021-09852-91434-60441434-6052https://doaj.org/article/783dc5a63ddd40b5a697ecfe291085c42021-11-01T00:00:00Zhttps://doi.org/10.1140/epjc/s10052-021-09852-9https://doaj.org/toc/1434-6044https://doaj.org/toc/1434-6052Abstract We apply the gravity-thermodynamics conjecture, namely the first law of thermodynamics on the Universe horizon, but using the generalized Kaniadakis entropy instead of the standard Bekenstein–Hawking one. The former is a one-parameter generalization of the classical Boltzmann–Gibbs–Shannon entropy, arising from a coherent and self-consistent relativistic statistical theory. We obtain new modified cosmological scenarios, namely modified Friedmann equations, which contain new extra terms that constitute an effective dark energy sector depending on the single model Kaniadakis parameter K. We investigate the cosmological evolution, by extracting analytical expressions for the dark energy density and equation-of-state parameters and we show that the Universe exhibits the usual thermal history, with a transition redshift from deceleration to acceleration at around 0.6. Furthermore, depending on the value of K, the dark energy equation-of-state parameter deviates from $$\Lambda $$ Λ CDM cosmology at small redshifts, while lying always in the phantom regime, and at asymptotically large times the Universe always results in a dark-energy dominated, de Sitter phase. Finally, even in the case where we do not consider an explicit cosmological constant the resulting cosmology is very interesting and in agreement with the observed behavior.Andreas LymperisSpyros BasilakosEmmanuel N. SaridakisSpringerOpenarticleAstrophysicsQB460-466Nuclear and particle physics. Atomic energy. RadioactivityQC770-798ENEuropean Physical Journal C: Particles and Fields, Vol 81, Iss 11, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
spellingShingle	Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 Andreas Lymperis Spyros Basilakos Emmanuel N. Saridakis Modified cosmology through Kaniadakis horizon entropy
description	Abstract We apply the gravity-thermodynamics conjecture, namely the first law of thermodynamics on the Universe horizon, but using the generalized Kaniadakis entropy instead of the standard Bekenstein–Hawking one. The former is a one-parameter generalization of the classical Boltzmann–Gibbs–Shannon entropy, arising from a coherent and self-consistent relativistic statistical theory. We obtain new modified cosmological scenarios, namely modified Friedmann equations, which contain new extra terms that constitute an effective dark energy sector depending on the single model Kaniadakis parameter K. We investigate the cosmological evolution, by extracting analytical expressions for the dark energy density and equation-of-state parameters and we show that the Universe exhibits the usual thermal history, with a transition redshift from deceleration to acceleration at around 0.6. Furthermore, depending on the value of K, the dark energy equation-of-state parameter deviates from $$\Lambda $$ Λ CDM cosmology at small redshifts, while lying always in the phantom regime, and at asymptotically large times the Universe always results in a dark-energy dominated, de Sitter phase. Finally, even in the case where we do not consider an explicit cosmological constant the resulting cosmology is very interesting and in agreement with the observed behavior.
format	article
author	Andreas Lymperis Spyros Basilakos Emmanuel N. Saridakis
author_facet	Andreas Lymperis Spyros Basilakos Emmanuel N. Saridakis
author_sort	Andreas Lymperis
title	Modified cosmology through Kaniadakis horizon entropy
title_short	Modified cosmology through Kaniadakis horizon entropy
title_full	Modified cosmology through Kaniadakis horizon entropy
title_fullStr	Modified cosmology through Kaniadakis horizon entropy
title_full_unstemmed	Modified cosmology through Kaniadakis horizon entropy
title_sort	modified cosmology through kaniadakis horizon entropy
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/783dc5a63ddd40b5a697ecfe291085c4
work_keys_str_mv	AT andreaslymperis modifiedcosmologythroughkaniadakishorizonentropy AT spyrosbasilakos modifiedcosmologythroughkaniadakishorizonentropy AT emmanuelnsaridakis modifiedcosmologythroughkaniadakishorizonentropy
_version_	1718408147905806336

Modified cosmology through Kaniadakis horizon entropy

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